function ptrng(v1,v2)
  return math.sqrt((v1^2)+(v2^2))
  end
for i=0,10,1 do
  a=math.floor(math.random(100));b=math.floor(math.random(100))
  print("ptrng("..tostring(a)..","..tostring(b)..")="..tostring(ptrng(a,b)))
  end

